CN115856765A - Direction finding correction method and device for improving direction finding precision - Google Patents
Direction finding correction method and device for improving direction finding precision Download PDFInfo
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Abstract
The application discloses a direction finding correction method and device for improving direction finding precision, which are applied to a digital beam forming system. Firstly, calculating a plurality of signal amplitude difference values to form a direction finding base, then calculating a real beam pointing angle to finish the correction of beam pointing, then inquiring the direction finding base according to the real beam pointing angle to obtain a deviation angle, summing the deviation angle and the real beam pointing angle to obtain a rough direction finding value, and finally obtaining a precise direction finding value through the rough direction finding value, the signal amplitude difference values, an azimuth angle interval and two adjacent amplitude ratio values of the rough direction finding value to perform parabola interpolation, so that the direction finding precision of an azimuth angle can be remarkably improved through the precise direction finding value.
Description
Technical Field
The application relates to the field of azimuth angle measurement, in particular to a direction finding correction method and device for improving direction finding precision.
Background
With the increasingly dense application of electromagnetic spectrum and high-power electronic equipment, the electromagnetic environment is more and more complex, the traditional electronic receiving equipment faces the problem of low sensitivity, the signal density received by the receiving equipment can be greatly increased after the sensitivity is improved, and the receiving equipment faces the problems of poor environment adaptability, signal parameter measurement errors, signal discovery false alarms, false alarm leakage and the like. As an airspace filtering technology, the digital beam synthesis technology simultaneously solves the contradiction between wide airspace coverage and high-sensitivity receiving, can greatly improve the working distance of a receiving system, can simultaneously search and track a plurality of targets in a wide airspace range remotely, is a main technical approach for realizing large-range and large-depth monitoring capability, and in addition, because the synthesized beam becomes narrow and the side lobe is reduced, the angle measurement precision and the resolution ratio of the system can be improved, the direction measurement precision is obviously higher than that of an analog multi-beam system, the direction measurement technology based on digital beam synthesis is favorable for inhibiting interference signals, and has better complex electromagnetic environment adaptability.
The digital beam forming system based on array signal receiving simultaneously forms a plurality of digital beams by an array antenna and a digital beam forming technology, is an extension of an analog phased array technology, is a new technology established after a digital signal processing method is introduced on the basis of the traditional analog beam forming, and is a product of the combination of the array antenna and signal processing. The digital beam synthesis and direction finding technology mainly utilizes an array antenna to receive electromagnetic signals in space, collects the signals in a time domain and a space domain, weights phases and amplitudes of the signals received by each antenna unit in a baseband to form digital beams with a certain shape to receive the signals, realizes spatial filtering of the signals, improves receiving processing gain of the signals, simultaneously can also utilize a plurality of digital beams to complete receiving of the signals, and realizes high resolution and accurate direction finding of a target through a digital signal processing algorithm.
The direction-finding method based on digital beam synthesis mainly comprises a range-comparison direction-finding method, a range-comparison direction-finding method of a sum beam and a difference beam commonly used in engineering and a range-comparison direction-finding method of an adjacent beam. The two direction-finding methods mainly comprise the steps of digital multi-beam synthesis, direction-finding library generation and table look-up direction finding. In the narrow-band beam synthesis method, the amplitude and the phase value of beam synthesis weighting are calculated by using the central frequency of the receiver in the working bandwidth of the receiver, when the weighting coefficients act on other frequency points in the bandwidth of the receiver, beam pointing will find deviation and a beam dispersion phenomenon occurs, if the signal bandwidth in the bandwidth of the receiver is small, the influence on signal reception is small, but the deviation of the beam pointing can directly influence the direction-finding precision. In addition, because the azimuth angle database building interval is a discrete value when the direction finding database is generated, the method cannot be infinitely dense, and in consideration of storage capacity and time consumption of calculation amount, the azimuth angle database building interval is generally 2 degrees or 1 degree in engineering. Since the azimuth database-building interval is a discrete value, but the signal incidence azimuth cannot be a discrete value, the azimuth database-building interval will influence the final direction-finding accuracy. Therefore, how to solve the above problems becomes a problem to be considered by those skilled in the art.
Disclosure of Invention
The purpose of the present application is to provide a direction finding correction method and device to overcome the existing technical defects, which can significantly improve the accuracy of azimuth measurement.
The purpose of the application is realized by the following technical scheme:
in a first aspect, the present application provides a direction finding correction method for improving direction finding accuracy, applied to a digital beam forming system, including:
calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction finding library;
calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum amplitude of the signal;
and inquiring the direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
And obtaining a direction-finding accurate value according to the direction-finding rough value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratio values of the direction-finding rough value.
Optionally, the calculation formula of the true beam pointing angle is as follows:
wherein, theta ′ For the true beam pointing angle, θ is the maximum beam pointing angle, f s For said signal frequency, f 0 Is the receiver center frequency.
Optionally, the step of querying the direction finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a coarse direction finding value includes:
inquiring the direction-finding library according to the real beam pointing angle to obtain a direction-finding library amplitude difference value;
calculating a signal amplitude difference value between a maximum beam pointing angle and a second largest beam pointing angle, wherein the second largest beam pointing angle is a beam pointing angle of the maximum signal amplitude adjacent to the maximum beam pointing angle;
obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
Optionally, the step of obtaining a deviation angle according to the direction finding library amplitude difference value and the signal amplitude difference value includes:
extracting a corresponding direction finding sub-library from the direction finding library according to the amplitude difference value of the direction finding library;
and inquiring the signal amplitude difference value through the direction finding sub-library to obtain a corresponding deviation angle.
Optionally, the calculation formula of the accurate direction finding value is as follows:
wherein, delta A 1 Is an amplitude ratio, Δ A, adjacent to the coarse direction-finding value 2 Is another amplitude ratio value adjacent to the direction-finding coarse value, Δ A is the signal amplitude difference value, Δ θ is the azimuth angle interval, α Coarse And the direction finding coarse value is obtained.
In a second aspect, the present application further provides a direction-finding correction method and apparatus for improving direction-finding accuracy, which is applied to a digital beam forming system, and the apparatus includes:
the direction-finding library generating module is used for calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction-finding library;
the beam pointing correction module is used for calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum signal amplitude;
and the direction-finding coarse value calculation module is used for inquiring the direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a direction-finding coarse value.
And the parabolic interpolation module is used for obtaining a direction-finding accurate value according to the direction-finding coarse value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratio values of the direction-finding coarse value.
Optionally, the apparatus includes:
the direction finding coarse value calculation submodule: the direction-finding library is inquired according to the real beam pointing angle to obtain a direction-finding library amplitude difference value;
calculating a signal amplitude difference value between a maximum beam pointing angle and a second largest beam pointing angle, wherein the second largest beam pointing angle is a beam pointing angle of the maximum signal amplitude adjacent to the maximum beam pointing angle;
obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
Optionally, the coarse direction finding value calculating sub-module is further configured to:
extracting a corresponding direction finding sub-library from the direction finding library according to the amplitude difference value of the direction finding library;
and inquiring the signal amplitude difference value through the direction finding sub-library to obtain a corresponding deviation angle.
The main scheme and the further selection schemes thereof can be freely combined to form a plurality of schemes which are all adopted and claimed by the application; in addition, the selection (each non-conflict selection) and other selections can be freely combined. The skilled person in the art will understand that there are many combinations, all of which are the technical solutions claimed in the present application, after understanding the scheme of the present application, based on the prior art and common general knowledge, and the present invention is not exhaustive.
The embodiment of the application provides a direction finding correction method and device for improving direction finding precision, which are applied to a digital beam synthesis system. Firstly, calculating a plurality of signal amplitude difference values to form a direction finding base, then calculating a real beam pointing angle to finish the correction of beam pointing, then inquiring the direction finding base according to the real beam pointing angle to obtain a deviation angle, summing the deviation angle and the real beam pointing angle to obtain a rough direction finding value, and finally obtaining a precise direction finding value through the rough direction finding value, the signal amplitude difference values, an azimuth angle interval and two adjacent amplitude ratio values of the rough direction finding value to perform parabola interpolation, so that the direction finding precision of an azimuth angle can be remarkably improved through the precise direction finding value.
Drawings
Fig. 1 shows a schematic flow chart of a direction finding correction method proposed in an embodiment of the present application.
Fig. 2 shows a schematic block diagram of a circuit provided by an embodiment of the present application.
Fig. 3 shows a schematic flowchart of step S300 proposed in the embodiment of the present application.
Fig. 4a shows a schematic diagram of beam pointing shifts of different frequencies according to an embodiment of the present application.
Fig. 4b shows an enlarged view of the beam of fig. 4a with a steering angle of 40 deg.
FIG. 5 is a diagram illustrating beam pointing shifts for different frequencies according to an embodiment of the present application;
fig. 6 shows a comparison diagram of the direction-finding error proposed in the embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application is provided by way of specific examples, and other advantages and effects of the present application will be readily apparent to those skilled in the art from the disclosure herein. The present application is capable of other and different embodiments and its several details are capable of modifications and/or changes in various respects, all without departing from the spirit of the present application. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the prior art, because the azimuth angle library establishing interval is a discrete value, but the incidence azimuth angle of a signal cannot be a discrete value, the azimuth angle library establishing interval has a certain influence on the final direction-finding precision. Although there are descriptions in the literature relating to direction finding methods in digital beam forming systems, no detailed steps have been mentioned for the specific implementation.
Therefore, the present application provides a direction finding correction method and device for improving direction finding accuracy, which are used to solve the above problems, and the present application improves the current literature on the basis of the direction finding method in the digital beam synthesis system, and adds two key steps of beam pointing correction and parabolic interpolation, so that the direction finding accuracy is significantly improved, and the following detailed description is provided.
Referring to fig. 1, fig. 1 is a schematic flow chart illustrating a direction finding correction method according to an embodiment of the present application, where the direction finding correction method is applied in a digital beam forming system, and the method includes the following specific steps:
and S100, calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction finding library.
The generation process of the direction finding library comprises the following steps: according to a direction finding frequency range and a space domain required by a digital beam synthesis system, signal amplitude difference values of beam pointing angles under different frequencies and different beams and beam pointing angles of two adjacent beams (a left beam and a right beam) are sequentially calculated according to frequency stepping, beam pointing stepping, multi-beam pointing intervals and azimuth angle intervals, and finally an amplitude difference direction finding library formed by multiple groups of beam pointing angles and multiple groups of signal amplitude difference values is formed.
It should be noted that the frequency step, the beam pointing step, and the azimuth angle interval can be determined according to the direction finding accuracy of the digital beam forming system, and can also be determined according to the beam design condition, which is not limited in the present application. For example, in a typical case, the frequency step is typically selected to be 1MHz, the beam pointing step is typically selected to be 0.2 degrees, and the azimuth interval is typically selected to be 1 degree.
And S200, calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum amplitude of the signal.
Before correcting the beam direction in a narrow-band digital beam forming system, please refer to fig. 2, where fig. 2 shows a schematic block diagram of a circuit provided in an embodiment of the present application, the digital beam forming system receives an electromagnetic wave signal transmitted by a signal source, the electromagnetic wave signal is fed through an antenna interface unit, frequency-converted to an intermediate frequency through a frequency conversion module, sampling is completed through an AD sampling module, the sampled digital signal is preprocessed, a plurality of beams are synthesized through digital multiple beams, the beam direction is corrected while a direction finding library is generated, so that a direction finding result is subjected to rough side, and finally parabolic interpolation is completed.
Since the weighting coefficients used for beamforming are calculated from the receiver center frequency, the weighting coefficients act on different signal frequencies to produce different beam orientations. Under a certain group of weighting coefficients, because the signal amplitude of each beam is different, the beam pointing angle corresponding to the beam with the maximum signal amplitude is found out firstly, and then the real beam pointing angle theta can be obtained through a calculation formula of real beam pointing according to the signal frequency, the central frequency of the receiver and the beam pointing angle ′ Finally, the beam pointing is corrected, and the real beam pointing angle theta ′ The calculation formula of (2) is as follows:
wherein, theta ′ For true beam pointing angle, θ is the maximum beam pointing angle, f s Is the signal frequency, f 0 Is the receiver center frequency.
It is worth mentioning that at the signal frequency and the receiver frequency are equal (f) s ＝f 0 ) In this case, the real beam pointing angle is the maximum beam pointing angle (θ) ′ (= θ) when the signal frequency and the receiver frequency are not equal (f) s ≠f 0 ) In this case, it indicates that the beam is shifted, and the beam can be switched onCalculating the real beam pointing angle theta by the formula ′ 。
S300, inquiring a direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
The coarse value of direction finding is obtained by summing the real beam pointing angle and the deviation angle, and the deviation angle is obtained by inquiring a direction finding library according to the real beam pointing angle. Next, a course of calculating a direction-finding coarse value in step S300 is explained, referring to fig. 3 based on fig. 1, fig. 3 shows a schematic flow chart of step S300 according to an embodiment of the present application, where step S300 includes:
s310, inquiring a direction-finding library according to the real beam pointing angle to obtain a direction-finding library amplitude difference value.
After calculating the real beam pointing angle theta ′ Then, the digital beam synthesis system queries a direction finding library amplitude difference value corresponding to the real beam pointing angle from a direction finding library, and different beam pointing angles and corresponding signal amplitude difference values are stored in the direction finding library.
And S320, calculating the signal amplitude difference value of the maximum beam pointing angle and the second largest beam pointing angle.
The second largest beam pointing angle is a beam pointing angle of the largest signal amplitude adjacent to the largest beam pointing angle, for example, if the signal amplitude of the left beam pointing angle adjacent to the largest beam pointing angle is larger than that of the adjacent right beam pointing angle, the left beam pointing angle adjacent to the largest beam pointing angle is selected as the second largest beam pointing angle, if the signal amplitude of the left beam pointing angle adjacent to the largest beam pointing angle is smaller than that of the adjacent right beam pointing angle, the right beam pointing angle adjacent to the largest beam pointing angle is selected as the second largest beam pointing angle, and if the signal amplitude of the left beam pointing angle adjacent to the largest beam pointing angle is equal to that of the adjacent right beam pointing angle, any one of the left beam pointing angle and the right beam pointing angle is selected as the second largest beam pointing angle.
S330, obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and in order to obtain the deviation angle, firstly extracting a direction finding sub-library corresponding to the amplitude difference value of the direction finding library from the direction finding library according to the amplitude difference value of the direction finding library, wherein the direction finding sub-library belongs to the direction finding library, then inquiring the direction finding sub-library according to the signal amplitude difference value, and then selecting the deviation angle according to a principle of proximity according to an inquired result.
And S340, summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
S400, obtaining a direction-finding accurate value according to the direction-finding rough value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratios of the direction-finding rough value.
After the coarse direction-finding value is obtained, three bank-building azimuth angles near the coarse direction-finding value can be selected, for example, one bank-building azimuth angle of the coarse direction-finding value which is deviated to the left and two bank-building azimuth angles which are deviated to the right are selected, two bank-building azimuth angles of the coarse direction-finding value which is deviated to the left and one bank-building azimuth angle which is deviated to the right can also be selected, and other various choices can be provided, which are not limited in the present application. At the moment, the amplitude difference value of the azimuth angle of the built library is separated from the azimuth angle of the built library, a parabolic curve is fitted according to the rough direction-finding value and the azimuth angle of the built library, and two adjacent amplitude ratio values delta A of the rough direction-finding value are selected through a parabolic equation representing the parabolic curve 1 And Δ A 2 And combining the signal amplitude difference value delta A, the azimuth angle interval delta theta and the direction-finding coarse value alpha Coarse And substituting a calculation formula of the accurate direction finding value:
and finally obtaining an accurate direction finding value.
In one possible implementation, please refer to fig. 4a and 4b, fig. 4a shows a schematic diagram of beam pointing shift of different frequencies proposed in the embodiment of the present application, and fig. 4b shows an enlarged diagram of the beam with a pointing angle of 40 ° in fig. 4 a. If the receiver center frequency is 830MHz and the instantaneous bandwidth is 60MHz, a beam with a pointing angle of 40 ° is formed, it can be known that the beam formed under the signal frequencies of 800MHz, 830MHz, and 860MHz with the same weighting coefficients has slightly different shapes and beam pointing directions, the beam pointing directions formed by the signal frequencies of 800MHz and 860MHz are about 2 ° different from the beam pointing direction formed by the frequency of 830MHz, which has little influence on signal reception, but if the direction finding with the frequencies of 800MHz and 860MHz is performed by looking up the table with the beam formed by the receiver center frequency of 830MHz as a reference, the direction finding error close to 2 ° is brought at most
In another possible embodiment, please refer to fig. 5. Fig. 5 shows a schematic diagram of beam pointing offsets of different frequencies proposed in the embodiment of the present application, and an error curve of direction finding of signals with frequencies ranging from 800MHz to 2000MHz without adding any error. It can be seen from the figure that, without any error influence, when looking up the table, if the beam direction corresponding to the signal frequency point is not corrected, a maximum direction-finding error of about 0.6 ° is brought.
In another possible embodiment, please refer to fig. 6, and fig. 6 shows a comparison graph of the direction-finding error proposed in the embodiment of the present application. Is an error curve for measuring the direction of a signal with the frequency of 800 MHz-2000 MHz under the condition of not adding any error. It can be seen from the figure that, under the condition of no error influence, after a coarse direction-finding value is obtained through a direction-finding table look-up, the direction-finding performance can be remarkably improved through parabolic interpolation.
The application has the following technical effects:
(1) According to the direction finding correction method provided by the embodiment of the application, the real beam pointing angle is calculated to finish the correction of the beam pointing direction, then the direction finding library is inquired according to the real beam pointing angle to obtain the deviation angle, the deviation angle and the real beam pointing angle are summed to obtain a coarse final value of the direction finding, and finally the accurate value of the direction finding is obtained to finish the parabolic interpolation, so that the direction finding accuracy of the azimuth angle can be remarkably improved.
(2) And through simulation comparison of a computer, a beneficial reference is provided for a direction finding method in a digital beam system.
(3) The direction-finding library is generated in advance according to the beam design after the digital beam system is determined, and then the direction-finding library is led into a real-time operation chip to be stored for subsequent real-time calculation, the beam direction correction, the direction-finding coarse value calculation and the parabolic interpolation only relate to a small number of trigonometric functions and addition, subtraction, multiplication and division calculation, the calculation amount is small, and the engineering realization is facilitated.
(4) The direction finding correction method provided by the application can also be used for azimuth angle measurement in a one-dimensional digital beam forming system and can also be used for pitch angle measurement in a two-dimensional digital beam forming system, and the idea of obtaining a direction finding accurate value through parabolic interpolation can also be used for an interferometer direction finding system.
Next, a possible implementation manner of the direction finding correction device proposed in the embodiment of the present application is given, which is used for executing each execution step and corresponding technical effect of the direction finding correction method shown in the foregoing embodiment and the possible implementation manner. The direction finding correction device comprises: direction finding library generation module, beam pointing correction module, direction finding coarse value calculation module and parabolic interpolation module
And the direction-finding library generating module is used for calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction-finding library.
And the beam pointing correction module is used for calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum amplitude of the signal.
And the direction-finding coarse value calculation module is used for inquiring a direction-finding base according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a direction-finding coarse value.
And the parabolic interpolation module is used for obtaining a direction-finding accurate value according to the direction-finding coarse value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratios of the direction-finding coarse value.
Optionally, the coarse direction finding value calculating module further includes a coarse direction finding value calculating submodule.
The direction finding rough value calculation submodule: the method is used for inquiring a direction-finding library according to the real beam pointing angle to obtain a direction-finding library amplitude difference value;
calculating the signal amplitude difference value of the maximum beam pointing angle and the second largest beam pointing angle, wherein the second largest beam pointing angle is the beam pointing angle of the maximum signal amplitude adjacent to the maximum beam pointing angle;
obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
Optionally, the direction-finding coarse value calculating sub-module is further configured to: extracting a direction finding sub-library from the direction finding library according to the amplitude difference value of the direction finding library,
and inquiring a deviation angle corresponding to the signal amplitude difference value through the direction finding sub-library.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (8)
1. A direction-finding correction method for improving direction-finding accuracy is applied to a digital beam forming system and comprises the following steps:
calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction finding library;
calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum amplitude of the signal;
inquiring the direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a direction-finding coarse value;
and obtaining a direction-finding accurate value according to the direction-finding rough value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratio values of the direction-finding rough value.
2. The direction-finding correction method of claim 1, characterized in that the calculation formula of the true beam pointing angle is:
wherein, theta ′ Is the realityBeam pointing angle, θ is the maximum beam pointing angle, f s For said signal frequency, f 0 Is the receiver center frequency.
3. The method of claim 1, wherein the step of querying the direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value comprises:
inquiring the direction-finding library according to the real beam pointing angle to obtain a direction-finding library amplitude difference value;
calculating a signal amplitude difference value between a maximum beam pointing angle and a second largest beam pointing angle, wherein the second largest beam pointing angle is a beam pointing angle of the maximum signal amplitude adjacent to the maximum beam pointing angle;
obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
4. The direction-finding correction method of claim 3, wherein the step of deriving a deviation angle from the direction-finding library magnitude difference and the signal magnitude difference comprises:
extracting a corresponding direction finding sub-library from the direction finding library according to the amplitude difference value of the direction finding library;
and inquiring the signal amplitude difference value through the direction finding sub-library to obtain a corresponding deviation angle.
5. The direction-finding correction method of claim 1, characterized in that the accurate direction-finding value is calculated by the formula:
wherein, delta A 1 Is an amplitude ratio, Δ A, adjacent to the coarse direction-finding value 2 As the coarse value of direction findingAnother adjacent amplitude ratio, Δ A being the signal amplitude difference, Δ θ being the azimuth interval, α Coarse And the direction finding coarse value is obtained.
6. A direction-finding correction apparatus for improving direction-finding accuracy, applied to a digital beam-forming system, the apparatus comprising:
the direction-finding library generating module is used for calculating a signal amplitude difference value according to the frequency stepping, the beam pointing stepping, the multi-beam pointing interval and the azimuth angle interval to form a direction-finding library;
the beam pointing correction module is used for calculating a real beam pointing angle according to the signal frequency, the receiver center frequency and the maximum beam pointing angle corresponding to the maximum signal amplitude;
and the direction-finding coarse value calculation module is used for inquiring the direction-finding library according to the real beam pointing angle to obtain a deviation angle, and summing the real beam pointing angle and the deviation angle to obtain a direction-finding coarse value.
And the parabolic interpolation module is used for obtaining an accurate direction-finding value according to the coarse direction-finding value, the signal amplitude difference value, the azimuth angle interval and two adjacent amplitude ratios of the coarse direction-finding value.
7. The direction-finding correction apparatus of claim 6, wherein the apparatus comprises:
the direction finding coarse value calculation submodule: the direction-finding library is inquired according to the real beam pointing angle to obtain a direction-finding library amplitude difference value;
calculating a signal amplitude difference value between a maximum beam pointing angle and a second largest beam pointing angle, wherein the second largest beam pointing angle is a beam pointing angle of the maximum signal amplitude adjacent to the maximum beam pointing angle;
obtaining a deviation angle according to the amplitude difference value of the direction finding library and the signal amplitude difference value;
and summing the real beam pointing angle and the deviation angle to obtain a coarse direction-finding value.
8. The direction-finding correction device of claim 7, wherein the coarse direction-finding value calculation sub-module is further configured to:
extracting a corresponding direction finding sub-library from the direction finding library according to the amplitude difference value of the direction finding library;
and inquiring the signal amplitude difference value through the direction finding sub-library to obtain a corresponding deviation angle.
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